International Journal of Information Security Science (IJISS)
Cloud computing is one of the fastest growing segments of IT industry since the users' commitments for investment and operations are minimized, and costs are in direct relation to usage and demand. In general, cloud services are required to authenticate the user and most of the practical cloud services do not provide anonymity of the users. Namely, cloud provider can track the users easily, so privacy and authenticity are two critical aspects of security. Anonymous authentication is a technique enabling users to prove that they have privilege without disclosing real identities.